Device for sharpening, filing, or dressing the teeth of circular saws



Dec. 15, 1931. Uw. B. HUTHER 1,836,120

DEVICE FOR SHARPENING, FILING, OR DRESSING THE TEETH OF CIRCULAR SAWS lNvENToR Dec. 15, 1931. w. B, HUTHER 1,836,120

DEVICE FOR SHARPENING, FILING, OR DRESSING THE TEETH 0F CIRCULAR sAws Filed Jan. 5, 1927 2 sheets-sheet 2 l f ,!lllllllllllllllglllllll lflll \{llllllll{llll Il jo i5 l lNvENToR f7 Warren Patented Dec. 15, 1931 UNITED STATES i. WARREN E'HUTHEE, or ROCHESTER, NEW YonxvassrGNoE 'ro -rrUTHEEYEEos I 'PATENT OFFICE rvIMIFG', C0., OF ROCHESTER', NEW YORK, A. CORPORATION OF NEW DEVICE EOE SHARPENING, FILING, r E DRESSING THE TEE'l-H 'or ernennen sAws'zf-L y Application-ined January 5, y1927. serial No. 159,054.

This invention relates to an improved device for sharpening, filing or dressing the teeth of 'circular saws.

o As a result of the usua-lswaging operation in connection with thevsharpening of saws,

the ends of the teeth are usually all of varying widths and have jaggedY edges. A saw atsuch stage of its 'sharpening cannot be eili- V ,Y ciently used, as the burden of cutting the groovewould be thrownk entirely uponV the widest tooth or upon the two teeth which extend outwardly the greatest distance on either side, which condition would result in burning or breaking of the tooth or teeth" Carrying Il' the burden. According to some present practices the dressing of the teeth after swaging is sometimes done by hand filing each tooth individually.V Hand filing is a slow and te# dious process and consequently expensive.' 26' It is also obviously inaccurate and a thoroughly uniform width cannot b'e obtained for all of theteeth. Various devices designed to eliminate hand lilinghave been proposed, A but they for the most` part haveI been complicated in construction, expensive to manufacture, and generally unwieldy and inflex-` ible in use.

' The prime'object of this invention is to provide a device of the above nature'which 3o' is thoroughly eihcient and dependable in operation.

Another object is to provide a device which is simple and inexpensive to manufacture.

Another object is to provide adevice'in which th'e'parts are easily replaceable.'

' Another object is to provide a device in' which partsmay be'readily substituted o'rA adjusted to permit its use on saws of various" Y sizes. d

Another Objectis to provide a device in which the tool may be adjusted to permit dressing of the teeth to different angles on different saws.

Another object is to provide a device which` The invention accordingly .consists in thev s'o 2 showsla` side elevation, partlyin Figure 3 shows'iay rear elevation .of the-upper,'or`head portion ofthe device;

Figure 4 shows'a .sectional.elevation-of the head member. as applied to a saw tooth wheninuse;' f l' f' Figure 5V is a rearf elevation of a portion of: the head member with bearing plate 36 removed; 'f

Figure 6 shows a sectional plan' view of thehead member; Y y

Figure 7 shows a side view ofthe device, partly' in section', with av saw held in position toloedressed; `Figure 8 shows a plan view ofthe arrangement shown in Figure; and 1. n w

Figure 9 showsa sectional'elevation of the hub or supporting member. l L

-Similarfreference 'characters refer to simi-l lar parts throughout the several views of the drawings. p y H yReferring now tothe drawings in detail, l() indicates generally the saw being dressed,

- 12 indicatesl a type of tooth which itis 'pro-v posed to dresswith my device, and 13' indicates generally my device. 'Y

'4 The device comprises a head, or tooth dress-- ing vmember 14, a hub, or supportingmember.'

15 andlever arm 16. v Y

'The hub member 15 comprises a vplate or disc 17 having on one side or. face aprojec-"f4 tionj18 having a'bore, or slot, extendingv completely therethrough and having a screw member 20 adapted to project transversely into said slot and bear upon vlever arm 16 mounted therein. The oppositesi'de or face is provided with a proj ecting'pin member 21:

of 'substantially circular'cross-section,'adapt-i ed to fit within a circular slot oifb'ore inthe.v

Y 2,5: is shown in Figure 6, a hub 23, a tool holder clamping member 45. The :member 45 is provided with a smooth upper surface adapted for contact with the smooth lower surface of theV member 17. The lower lface of member 45 isprovided with a projecting shoulder portion 46 and a threaded member 47. The

' shoulder portion 46 is preferably circular in cross-section and is adapted to lit within the arbor of thesaw to ybe dressed. The threaded Y ly circular cross-section and it is provided at one end with'a. transversely extending slo-t Vor bore.

The head member 14 comprises a rectangular yoke 22, of which a cross-sectional plan 24, a tool carrier 25, a tool 26, an adjusting screw 27 and set screws 28, 30, and 31.

- The yoke isprovided with a transverseslot as indicated at 32V (Fig.,6) and the hub 23 is attached to the front wall of the yoke substantially centrally of said slot. The-hub' 23-is provided with a slot or bore for the reception of an end of l.the lever arm 16, and has attached thereto at opposite sides the trunnions or lugs 33, the outer ends of which are smoothV to provide bearing` surfaces.Y The lugs or trunnions are provided with a slot or bore extending completely therethrough substantially centrally thereof and intersecting the slot or bore of the hub 23. f i

Theyoke 22 comprises a channel-shaped memberhaving Yside walls 34 and a wall35 forming the front wall of the yoke. .A plate 36 extends between theside walls of the channel and isY releasably attached thereto, by means of screws 37. VTheplate 36 'forms the rear wall ofthe yoke. The outer side of the plate 36 is smooth toprovide a bearing surface. In the modification shown they side `walls 34 have nprojecting lugs 39 to provide additional surface for hand gripping.

A pin 38 extends through the slots in the trunnions, hub and lever arm and'projects beyond the outer ends of the trunnions, as 1s j clearly shown in Figure 5. ,i

" Y The tool holder 24 comprises a guide .por-

tion 40, which is substantially semi-cylindrical 'in' form, or, substantially semi-circular 1n cross-sectional outline, having attached J thereto leg members 41. The Vouter ends of the said` leg members are slotted or bored and the innenfaces of the said ends are smoothV toprovide bearing surfaces. The tool holderextends through the slot in the yoke 4with substantially entirely above the said yoke and with the concave surfacethereof facingi the rear wall of the yoke and' having mounted thereon the tool carrier The slotted ends of the leg members are pivotally mounted on the projecting ends of thefpin 38. The portion 40 of the .tool holder is provided with an arcuate slot indicated by the numeral 42 in Figure 4.

H The tool carrier 25 is-.substantiallyV semi-V cylindrical in formv and is provided on its flat surface with a groove for the'reception of a tool 26, which in this instance is a square file,

-on its curved surface adjacent the flat surface with set screws 31 having communication with the said groove and contact with the tool therein, and on its curved surface, substantially centrally thereof, with an adjusting, or set screw which extends through the groove 42 in the tool holder and has its :v-

head portion contacting with the outersur-f face of the portion of the tool holder'.- The concave surface of the tool holder and the convex surface of the tool carrier are of the same curvature.

Adjusting screw 27 is mounted on the tool holder 24 with itsl head clearf of the yoke and the other end bearing upon the inner face of the plate 36 which forms the-rear wall of the yoke.

i i? Set screws 28 are mounted Von the front wall of they yoke with their head ends prothat the two surfaces lie in the same plane Y when the members and 17 are in contact.V

When a saw is to be dressed it is lplaced on the base or support with its arbor opening coinciding with the slot 48, and a clamping member 45 having a shoulder 46 of proper thickness and cross-section to fit the arbor openingV is screwed into the slot 48 and the sawv is thereby centered and looked Yin position. Y

The screws 20, 27, 28 and 30 are then loosened and the device applied to the upper surface of the saw held in a horizontal positionv with the pin 21 proj ecting` into the slot in the member 45and the bearing surface of the yoke lying fully in contact with the upper face ofthe saw. The proper length of Vlever. Y

arm is thenobtained vby sliding the lever Y arm 16 the required amount and locking in position by'meansofl the screw 20.Y The-tool and tool carrier .are next-adjusted to the proper tooth angle by swinging the toolica'rrier in the holderfand locking in position by means of the screw 30, allowance being made for a slight changing of the angle from the next following setting which is yfor the purpose of providing for the elimination of the burrs or rough edges of the teeth caused by the` sWagin-g. The bearing surface of the yoke is then moved away from the face of the saw a distance 'equal to the depth to be cut by the tool by operating the screws 27 and 28 in conjunction witheach other and exerting an upward pressure Von the lever varm to separate the members l-and 45 slightly The lever arm may be suiiiciently'flexible to permit the yoke to be moved away from the surfaceof the saw Without movingthe surfaces of mem bers 45 and 17 out of contact.

The setting operations having'been completed the device is operated by gripping the yoke,-applying a proper amount of pressure and rotating the'device about the pin 21 as an axis. When the proper depth ofcut has been made the bearing face of the yoke comes into contact with the face of the saw and the lower surface of the member 17 comes into contact with the upper surface of member 45 and further cutting is impossible.

From the foregoing it will be seen that there is herein provided, in the embodiment shown, a device Which embodies the features of this invention, and achieves the objects thereof. An improved savv dressing device is provided which is dependable in use and by means of which the saw teeth are vthoroughly and accurately dressed for the purposes and in the manner first above pointed out.

As many possible Iembodiments may be made of the above invention, and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim as my invention:

l. A saW dressing device comprising a hub member, a lever arm, and a head member; said hub memberV being provided with an opening for the reception of said lever arm and means for locking said hub in position on said lever arm; said lever arm being circular in cross-section and being provided With an opening adjacent one end; said head member comprising ayoke provided with an aperture, a hub member attached to said yoke substantially centrally of said aperture and being provided With an opening for the reception of an end of the lever arm, said hub being i further provided With lugs on opposite sides thereof, said lugs having bearing surfaces on their outer ends, an opening extending substantially centrally through saidvlugs and intersecting the lever arm opening inthe hub, a pin member extending through the op-enings in 4the lugs 'and the opening in the lever arm and having itsI ends projecting beyond the ends of the lugs, a tool hol-der pivotally mounted on the ends of said pin and extending7 through the yoke aperture, means mounted on said-tool holder and contacting Withv a side of said yoke for adjusting the tool holder,

position, said too-l holder being provided at one end with an arcuate groove'and an arcuate -slot, a substantially semi-cylindrical tool carrier mounted in said groove and adjustably attached to said tool holder passing throu'ghsaid arcuate slot.

f 2, In a saw-dressing device a lever'ar-m, 'a' tooth dressing member comprising a yoke and a tool holder, said yoke having a bearing surface secured thereto, a single means for rigid attachment of said yoke and lever arm to each other and pivotal attachment of said 'tool holder thereto, and means associated with said yoke for adjusting and holding said tool holder in predetermined position relative to said arm and said bearing surface.y j 3. In a saw dressing device, a head mem# bercomprisingv a substantially Vrectangular yoke provided with a transversely extending aperture, a hub member attachedto said yoke and provided with a longitudinally extendmg opening, a pin member'mo'unted within 'said hub opening and having its ends projecting beyond the sides of said huba tool holder pivotally mounted'on said p in and extend? ing through the aperture insaid yoke, means for angularly adjusting said tool-holder relatively to said yoke, means for locking said tool holder in its ladj usted position and a tool adjustably attached to said tool holden 4; In a saw dressing device, a yoke comprising a substantially channel-shaped meml Y ber having a plate extending betweenand re-` movably attached to the 4sides of the' channel,

said plate having its outer side smooth to provide a bearing surface', land a hubgmember attached to the channel-shaped Amember sub-4 stantially centrally thereof, said hub being provided with an opening extending in the direction of the channel for the reception of a lever arm and a transversely extending openingl extending completely therethrough and intersecting said lever arm receiving slot.

5.:In a saw `dressing device, a tool holder comprising a substantially y'semi-circular memberprovided with an arcuate slot, leg

Y members attached to said semi-circular, member and provided at their ends With trans-Y versely extending openings, a channel-shaped member Within said semi-circular member and. adjust'ably attached thereto` by means extending'through the slot in the semi-circular member, the curvatures of theouter surby means iin ifo

face of the channel-shaped. member and the inner VVsurface ofuthesemi-.circular member `being substantiallyv the same to permit relative movement therebetween.

. Y 6. Ina savvdressing device, a radial member, a tool holder pivotally secured lto said member and provided With a groove andan arcuate slot, a channel-shaped member Seated in said groove and adjustably attached to said c :lo

',tool holder by means extending through said arcuate slot, a savv dressing tool removably seated Within said channel-shaped member, 'and means associated with said radial member for varying the angular relation of said 'tool holder relative to said radial member, the contacting surfaces of the tool holder and the channel-shaped member being of substantially the same curvature to permit relative l movement, said tool holder and channel shaped member extending substantially the 26 full length of said tool. v

.tool carrier mounted kon said tooly holder for angular adjustment relative thereto, and a saw' dressing tool carried by said tool carrier for engagingthe sides of the teeth'on said v 8. In a savvdressing device, including a radially extending arm, forvuse with aclrcular saw having an arbor opening centrally thereof, the combination With a support for said saw, ofv a locking member adjacent said arbor opening for centering and locking's'aid savv on said support, and a yportion pivotally mounted on said member for engaging said arm, said portion being provided With guide means for holding said radially extending armY in adjusted position and being removable independentlyof said saiv'locking member. l 9. In` a saw dressingdevice for use with a circular saw having an arbor opening centrally thereof, thecombination With a support for said saw, said support having a depression thereinl and a portion contacting With one faceof said savv, of a locking mem- "ber contacting With the face of the saw opposite to that in contact with the support and having a portion thereof extending through the saw arbor opening and into said depression for centering and locking said saw to v said support, saidlocking member having a cavity Vconcentric With said saW, a savT dressing tool, and means including a lpin extending into Vsaid cavity and' rotatable therein for securingsaid saw'dressing tool to said support for rotation concentrcally with relation to said savv..

- .10; In asaw 'dressing Ydevice for'use vvith a circular sawhaving an arbor opening cen- Y sion therein and a portion contacting with one-face of said savv, of a locking member contacting with the face of the savv opposite to that in contact With the support and having a portion thereof extending through the savv arbor and into said depressionifor centering and locking saidsavv toy saidfsupport, said locking member having a cavity concentric with said saw, a saw dressing tool including an arm extending substantially radially of said saw, andmeans for connecting said arm to saidsupport, said means comprisin' a pin extending into-.said cavity and rotata le therein so that said dressing'tool may be swung circumferentially around said `savv and concentrically therewith by rotating said pin in said cavity, said means also comprising a guide in Which said arm is longitudinally slidable and mechanism associated With vsaid guide for holding said arm in adjusted WARREN B. HUTHER.

position. 

